CVE-2011-4861: Schneider Electric Quantum Ethernet Module 140noe77100

High severity, CVSS 10.0. EPSS: 3% chance of exploitation in the next 30 days.

The modbus_125_handler function in the Schneider Electric Quantum Ethernet Module on the NOE 771 device (aka the Quantum 140NOE771* module) allows remote attackers to install arbitrary firmware updates via a MODBUS 125 function code to TCP port 502.

Affected products

• Schneider Electric Quantum Ethernet Module 140noe77100: up to and including 3.3; up to and including 3.4
• Schneider Electric Quantum Ethernet Module 140noe77101: up to and including 4.9
• Schneider Electric Quantum Ethernet Module 140noe77111: up to and including 5.0

Published 2011-12-17. Last modified 2026-06-16.